Oracle Linux: Unusually High Network Packet Retransmission Rate Observed During iperf Testing (Doc ID 2833194.1)

Last updated on OCTOBER 30, 2023

Applies to:

Symptoms

Two Oracle VM Servers of identical system/network hardware each host multiple Oracle Linux (OL) Virtual Machine (VM) guests.
The network performance of OL guests running on one Oracle VM Server is found to be ~2Gbps less than similarly configured guests running on the other Oracle VM Server.
Running iperf network performance testing on a GOOD and BAD guest produced the following output:

 Interestingly, the network performance of poorly performing guests improved to expected levels once migrated to the other Oracle VM Server.
 Similarly, network performance of correctly performing guests degraded once migrated to the other VM Server.

Cause

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